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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
Just bring layers. Late September is the most-perfect time for weather in Napa Valley. It may get far hotter than 80 during the day, but will always cool at night. Sturdy sandals and walking shoes highly recommended (not heels), and casual during the day is OK. Many visitors like to take it up a notch for fine dining ...